Answer:
-2 
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
1.
 
 
m= 
b= 2
2.

m= 
b= 1
3.

m= 3
b=4
Step-by-step explanation:
1. The line intersects the y-axis at the point (0,2) therefore its y-intercept is b=2. 
The line rises up 1 unit on the y-axis for every 4 units on the x-axis therefore the line has a slope of m=1/4. 
Considering the equation of a line (y=mx+b), we plug in the variables we have found into the formula to find that  
 
2. The line intersects the y-axis at the point (0,1) therefore its y-intercept is b=1. 
The line down up 1 unit on the y-axis for every 3 units on the x-axis therefore the line has a slope of m= -1/3. 
Considering the equation of a line (y=mx+b), we plug in the variables we have found into the formula to find that    
3. The line intersects the y-axis at the point (0,4) therefore its y-intercept is b=4. 
The line rises up 3 units on the y-axis for every 1 unit on the x-axis therefore the line has a slope of m=3. 
Considering the equation of a line (y=mx+b), we plug in the variables we have found into the formula to find that  
 
        
             
        
        
        
1.6 min. per lap
All you have to do is divide 20 by 12.5
        
                    
             
        
        
        
Answer:11 miles
Step-by-step explanation: